— 50 — 
We have still to communicate briefly the results which we obtained 
in an examination of volatile extract oil of orange-blossoms. This 
examination was made in continuation of our work on neroli oil, which 
has already been reported in these pages About 3 kilos of an 
extract supplied by Mr. Jean Gras of Cannes were worked up. 
After dividing in two portions, we treated it in the usual manner with 
alcohol, and after removing the alcohol, distilled the essential oil 
in vacuo with steam. 2300 grams extract yielded about 280 grams 
oil of the following physical constants: d^50= 0,9293; saponification 
number 91,3, corresponding to 32 per cent, linalyl acetate; the con- 
tent of methyl ester of anthranilic acid was found after Erdmann's 
method at 9,6 per cent, after that of Hesse and Zeitschel at 
9,5 per cent. In consequence of the deep dark -brown colour of the 
oil, the optical rotation could not be ascertained. The remaining portion 
of the extract yielded still 120 grams essential oil. What was specially 
remarkable in this oil was the unusually high content of anthranilic 
acid ester, which we determined at 1 5,0 per cent. We were, namely, 
able to isolate from the oil about 18 grams solid ester of the boiling 
point 104° (4 to 5 mm pressure), of the melting point 24,2°, and 
having the congealing point 23°. Hesse and ZeitscheT'^) mention 
the content of anthranilic acid ester in an essential extract oil as 
6,5 per cent. Their statements as regards the other constants also 
difler considerably from our figures, from which it may be concluded 
that the composition of essential extract oils of orange blossoms is 
subject to quite important fluctuations. 
The first -named oil passed over between 80° (30 mm pressure) 
and 150° (5 mm pressure). In the lowest boiling portion of the oil, 
' which amounted to only a few grams, we were able to detect traces 
of benzaldehyde by means of its semicarbazone. The crystals which 
dissolved with difficulty in alcohol melted at 214°; when heated with 
dilute sulphuric acid, they developed the characteristic odour of benz- 
aldehyde. The specific gravity of this fraction was 0,8591, the optical 
rotation, — 4^42', the boiling point 162° to 185°. 
In the oil partly freed from benzaldehyde, which probably consisted 
chiefly of terpenes, we endeavoured to detect pinene and dipentene or 
limonene. We did not, however, succeed in obtaining from it either 
the nitroso chloride of the first-named, or a bromide of one of the 
two last-named terpenes. 
1 - 1 i n a 1 o o 1 forms one of the principal constituents of the oil. 
It was identified by means of a fraction of the boiling point 70° to 
72° (5 mm pressure), from which we obtained by repeated fraction- 
ating an oil of the following properties: boiling point 197° to 198°; 
1) Report October 1902, 52. April 1903, 55. 
^) Journ. f. prakt. Chemie 11. 66 (1902), 513. 
